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x in (-oo:+oo)
x = (3/4)*(y-28)+12 // - (3/4)*(y-28)+12
x-((3/4)*(y-28))-12 = 0
(-3/4)*(y-28)+x-12 = 0
x-3/4*(y-28)-12 = 0
x-3/4*(y-28)-12 = 0
x-3/4*y-12+21 = 0
x-3/4*y+9 = 0
x-3/4*y+9 = 0
x-3/4*y+9 = 0 // - 9-3/4*y
x = -(9-3/4*y)
x = -(9-3/4*y)
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